Electrode Assembly Winding with Preset Separator Protrusion
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Solution Overview
Problem
Current battery manufacturing lacks a suitable winding device to enhance the safety performance of electrode assemblies, leading to inefficiencies in industrial production and increased risks of short circuits due to lithium dendrite penetration.
Innovation Solution
A winding device with a drawing mechanism that extends and winds a protruding separator section to a preset length, ensuring multiple layers between the negative and positive electrode plates, reducing the likelihood of lithium dendrite penetration and enhancing safety performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a winding device is introduced to improve manufacturing efficiency, then productivity increases, but the complexity of the device increases
Solution Approach 1:
The winding device is divided into independent functional modules: a feeding mechanism for supplying separators, a winding mechanism for the actual winding operation, and a drawing mechanism for controlling separator protrusion. Each module operates independently but coordinates with others, allowing the system to achieve high productivity without excessive overall complexity.
Solution Approach 2:
The drawing mechanism pulls the separator to a preset protruding length before the winding process begins. This preliminary action ensures that the separator is properly positioned and tensioned, enabling the winding mechanism to operate efficiently from the start and maintain consistent winding quality throughout production.
2Reliability
If multiple layers of separator are stacked to prevent lithium dendrite penetration, then safety performance improves, but the device complexity increases
Solution Approach 1:
Instead of adding complex multi-axis control systems to manage multiple separator layers, the invention uses the radial dimension of the winding process itself. The separator protrudes radially from the winding core, and multiple layers are formed naturally as the winding progresses, with each layer automatically stacking concentrically. This dimensional approach simplifies the device while ensuring safety.
Solution Approach 2:
The winding process itself creates the multi-layer separator structure without requiring additional specialized mechanisms. As the separator is fed and wound, it automatically forms concentric layers around the core, with the drawing mechanism simply maintaining proper tension and protrusion. The system uses the winding action to achieve the safety feature rather than requiring separate complex mechanisms.
3Reliability
If the separator protruding section is extended to preset length, then safety performance improves, but the manufacturing precision requirements increase
Solution Approach 1:
The drawing mechanism incorporates a feedback control system that monitors the separator protruding length in real-time. When the preset length is achieved, the system automatically adjusts or stops the drawing action, ensuring consistent precision without requiring overly complex manual measurement and adjustment procedures. This feedback loop maintains safety while managing precision requirements through automation.
Data Source
AI summary
This application relates to a winding device and a winding method, and pertains to the field of battery manufacturing technology. This application proposes a winding device including: a winding component; and a drawing mechanism, where the drawing mechanism is configured to draw a protruding section of a separator after the separator is led out of the winding component, so that length of the protruding section reaches a preset value. The winding component is configured to start winding after the length of the protruding section reaches the preset value, to form an electrode assembly. This application further proposes a winding method for forming an electrode assembly through winding. The winding device and the winding method are used for forming an electrode assembly with high safety performance through winding, so as to implement industrial production of the electrode assembly and improve manufacturing efficiency of the electrode assembly.